$vCenterServer = MyvCenterServer.domain.local #Enter your vCenter server FQDN here

#Connect to vCenter Server
$VC = Connect-VIServer $vCenterServer

#Gathering data
ForEach ($vm in get-vm)
{
	$vmView = $vm | get-view
	
	Write-Host "======"
	Write-Host "VM: $($vm.Name)"
	Write-Host "Current Limit: $($vmView.config.MemoryAllocation.Limit)"
	
	If ($vmView.config.MemoryAllocation.Limit -ne -1)
	{
		#Preparing modified data
		$spec = New-Object VMware.Vim.VirtualMachineConfigSpec
		$MemoryAllocation = New-Object VMware.Vim.ResourceAllocationInfo
		$MemoryAllocation.Limit = -1
		$spec.MemoryAllocation = $MemoryAllocation
		
		#Applying modification
		Write-Host "Removing Memory Limit"
		$vmView.ReconfigVM($spec)
		
		#Reloading data
		$vm = get-vm $vm.name
		$vmView = $vm | get-view
		Write-Host "Current Limit: $($vmView.config.MemoryAllocation.Limit)"
	}
	
	#Cleanup
	Clear-Variable vmView -ErrorAction SilentlyContinue
}

#Disconnect
Disconnect-VIServer $vCenterServer -Confirm:$false